energy change

Question 1

what are exothermic reactions

Answer 1

transference of reactants energy to the surroundings
surroundings temp will increase

Question 2

what are endothermic reactions

Answer 2

tranfering of energy from the surroundings to the reactants/products
causes a fall in temp of the surroundings

Question 3

what does a reaction profile for an exothermic reaction look like

Answer 3

products have a lower energy level than reactants as theyve been tranferred to the surroundings
the energy change is the amount released to surroundings, heating them

Question 4

what does a reaction profile for an endothermic reaction look like

Answer 4

products are higher than reactants as they have gained energy from the surroundings

Question 5

whats activation energy

Answer 5

amount of energy needed before the colliding particles have enough energy for a reaction to take place
on the graph thing is like the hump that goes upwards

Question 6

what kind of process is bond breaking

Answer 6

endothermic as energy has to be supplied to have the activation energy to break the bonds

Question 7

what kind of process is bond forming

Answer 7

exothermic idk why

Question 8

how to decide if the reaction is endo or exothermic

Answer 8

sometimes the energy released by new bonds is greater than that taken in to break them which makes it exothermic
and vice versa

Question 9

give two endothermic reactions

Answer 9

thermal decomposition
citric acid and sodium

Question 10

two exothermic reactions

Answer 10

neutralisation